A colorless, nearly odorless, sweet-tasting, hygroscopic liquid, formula HOCH₂CH₂OH. It is relatively nonvolatile and viscous and is the simplest member of the glycol family. Ethylene glycol freezes at −3°C (8.6°F), boils at 197.6°C (387.7°F), and is completely soluble in water, common alcohols, and phenol. Low molecular weight, low volatility, water solubility, and low solvent action on automobile finishes make ethylene glycol ideal as a radiator antifreeze and coolant; water mixtures (58–80% glycol) freeze below −46°C (−50°F).